OptiStrand103 implants are indicated for interstitial implantation of select localized tumors with low to moderate radiosensitivity. They are used either as primary treatment for tumors such as those of the head, lung, neck, pancreas, breast, cervix, prostate, and unresectable tumors, or for residual disease after excision of the primary tumor. OptiStrand103 implants are indicated for use concurrent with or at the completion of other treatment modalities, such as external beam radiation therapy or chemotherapy.
Device Story
OptiStrand103 consists of OptiSource seeds (K040766) linked by spacers to form a multi-seed sourcetrain; used for interstitial brachytherapy; implanted into localized tumors (head, lung, neck, pancreas, breast, cervix, prostate); provides localized radiation therapy; used as primary treatment or for residual disease; administered by clinicians; facilitates precise seed placement within tumor tissue; benefits patients by delivering targeted radiation while sparing surrounding healthy tissue.
Clinical Evidence
No clinical data provided; bench testing only.
Technological Characteristics
Radionuclide brachytherapy source; multi-seed sourcetrain configuration; consists of OptiSource seeds linked by spacers; Class II device per 21 CFR 892.5730.
Indications for Use
Indicated for interstitial implantation in patients with localized tumors of low to moderate radiosensitivity, including head, lung, neck, pancreas, breast, cervix, prostate, and unresectable tumors, or residual disease post-excision. Used as primary treatment or concurrent/adjuvant to external beam radiation or chemotherapy.
Regulatory Classification
Identification
A radionuclide brachytherapy source is a device that consists of a radionuclide which may be enclosed in a sealed container made of gold, titanium, stainless steel, or platinum and intended for medical purposes to be placed onto a body surface or into a body cavity or tissue as a source of nuclear radiation for therapy.
Special Controls
*Classification.* Class II (special controls). A prostate seeding kit intended for use with a radionuclide brachytherapy source only is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 892.9.
{0}------------------------------------------------
JAN 2005
K043336
| | 2 December 2004 | CONFIDENTIAL | Page 16 of 16 |
|--------|----------------------------------------------------------|--------------|---------------|
| Title: | Premarket Notification: Traditional 510(k) – OptiStrand™ | | |
**510(k) SUMMARY**
| <b>Applicant /Manufacturing Site:</b> | IBt s.a. |
|---------------------------------------|------------------------------------------------|
| | Zone Industrielle C |
| | 7180 Seneffe - Belgium |
| Tel: | (+32) 64 / 520 811 |
| Fax: | (+32) 64 / 520 801 |
| Establishment Registration Number: | 9031509 (IBt s.a.) |
| Contact Person IBt s.a.: | Sylviane Berger, Management Representative |
| E-mail: | sberger@brachytherapy.be and FDA@ibt4seeds.com |
| <b>Official Correspondent:</b> | |
| | IBt, Inc. |
| | 6000 Live Oak Parkway, Suite 107 |
| | Norcross, GA 30093 |
| Tel: | (770) 582 0662 |
| Fax: | (770) 582 0657 |
| Establishment Registration Number: | 9035105 (IBt, Inc.) |
| Contact Person IBt, Inc.: | Ruth Feicht, Regulatory |
| E-mail: | rfeicht@ibt4seeds.com and FDA@ibt4seeds.com |
| <b>Device Information</b> | |
|---------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------|
| Trade Name: | OptiStrand <sup>103</sup> (OptiStrand™ is a Trademark of IBt s.a.) |
| Model Number: | 1032S |
| Common Name of Device | Sealed Source; seed; interstitial implant |
| Description: | OptiStrand <sup>103</sup> implants are OptiSource™ seeds (#K040766) linked together with a spacer or spacers to create a multi-seed sourcetrain. |
| <b>Type of 510(k) Submission:</b> | Traditional |
|-----------------------------------|-------------|
|-----------------------------------|-------------|
| <b>Classification Information</b> | |
|-----------------------------------|-----------------------------------|
| Classification: | Radionuclide Brachytherapy Source |
| Class of Device: | 21 CFR 892.5730, Class II |
| Product Code: | 90-KXK |
**Intended Use**
OptiStrand<sup>103</sup> implants are indicated for interstitial implantation of select localized tumors with low to moderate radiosensitivity. They are used either as primary treatment for tumors such as those of the head, lung, neck, pancreas, breast, cervix, prostate, and unresectable tumors, or for residual disease after excision of the primary tumor. OptiStrand<sup>103</sup> implants are indicated for use concurrent with or at the completion of other treatment modalities, such as external beam radiation therapy or chemotherapy.
{1}------------------------------------------------
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
JAN 2 1 2005
IBt, s.a. % Ms. Ruth Feicht Regulatory IBt, Inc. 6000 Live Oak Parkway, Suite 107 NORCROSS GA 30093
Re: K043336 Trade/Device Name: OptiStrand103 (OptiStrand™ is a Trademark of IBt, s.a.) Regulation Number: 21 CFR 892.5730 Regulation Name: Radionuclide brachytherapy source Regulatory Class: II Product Code: 90 KXK Dated: December 2, 2004 Received: December 8, 2004
Dear Ms. Feicht:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced within to reviewed the device is substantially equivalent (for the indications for use stated in above und nave deegally marketed predicate devices marketed in interstate commerce prior to the cleasars) to regally that the Medical Device Amendments, or to devices that have been May 20, 1770, the classicans of the Federal Food, Drug, and Cosmetic Act (Act) that recrassmed in accordantes approval application (PMA). You may, therefore, market the do not require approvisions of the Act. The general controls provisions of the Act. include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket n your do rio result subject to such additional controls. Existing major regulations affecting your Apple can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the I our an bailers and and and limited to registration and listing (21 CFR Part 807); labeling / (21 CFR Part 801); good manufacturing practice requirements as set forth in the quality systems (QS) (21 CFR Part 807), and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
{2}------------------------------------------------
This letter will allow you to begin marketing your device as described in your Section 510(k) This letter will anow you to begin marketing your antial equivalence of your device to a legally
premarket notification. The FDA finding of substantial equivalence of the mo premarket notification. THE FDA Inding of Sacsantal vice and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please If you desire specific advice for your device of our lasting organized on the regulation number at the top of this letter:
| 21 CFR 876.xxxx | (Gastroenterology/Renal/Urology) | 240-276-0115 |
|-----------------|----------------------------------|--------------|
| 21 CFR 884.xxxx | (Obstetrics/Gynecology) | 240-276-0115 |
| 21 CFR 892.xxxx | (Radiology) | 240-276-0120 |
| Other | | 240-276-0100 |
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Also, please note the regulation on entired, "Albertation on your responsibilities under the Act from the 807.97). You may outlair other general missistance at its toll-free number (800) Division of Small Manufacturers, Internet address http://www.fda.gov/cdrh/dsmaldsmamain.html
Sincerely yours,
Nancy C. Brogdon
Nancy C. Brogdon Director, Division of Reproductive, Abdominal, and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
{3}------------------------------------------------
510(k) Number (if Known):
K043336
Device Name: OptiStrand103
Indications For Use:
OptiStrand103 implants are indicated for interstitial implantation of select Optiotrand - implants are indiosensitivity. They are used either localized tumors with fow to firs such as those of the head, lung, neck, as primary treatment for tumble eden as thesectable tumors, or for residual pancreast, breast, cervix, prostate, and unresocials/ callistics are ulsease anch exolon of the prither with or at the completion of other treatment Indicated for use conourront wan or adiation therapy or chemotherapy.
## (PLEASE DO NOT WRITE BELOW THIS LINE ~ CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
Prescription Use
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Over-The-Counter-Use__________________________________________________________________________________________________________________________________________________________
Nancy Gordon
(Division Sizn-Off) Division of Reproductive, Abdominal, and Radiological Devi \$10(k) Number
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Learn the FDA Browser
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.